Commitments, Contingent Liabilities And Litigation And Regulatory Matters (Narrative Excluding Litigation) (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Commitments And Guarantees And Contingent Liabilities [Abstract]
Total outstanding mortgage loan commitments	$ 72	$ 5
Obligation to purchase or fund investments	$ 90	$ 36

Commitments And Guarantees Contingent Liabilities And Litigation And Regulatory Matters [Abstract]

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